Improvement in adding-machines



" M. M. SMITH.

. ADDING-MACHINE. No. 193,425. Patented July 24,1877.

IIIIIII xv ATTORNEYS.

UNITED STATES MARSHALL M. SMITH, OF KIRKSVILLE, MISSOURI.

IMPROVEMENT IN ADDING-MACHINES.

Specification formingp'art of Letters Patent No. 193,425, dated July 24,1877; application filed May 5,1877.

To all whom it may concern:

Be it known that I, MARSHALL M. SMITH, of Kirksville, in the county ofAdair and State of Missouri, have invented a new and ImprovedAddi-ng-Machine, of which the following is a specification:

In the accompanying drawings, Figure 1 represents a side elevation; Fig.2, an-end elevation, partly in section, of my improved adding machine.Figs. 3 and at are detail views of the inner and outer operating-shafts,and Fig. 5a side view of thecatch-lever.

Similar letters of reference indicate corresponding parts.

The invention is intended to combine the advantages of an adding-machineand paperweight in a cheap, neat, and convenient manner, it beingreliable and durable in use, and operated with accuracy and dispatch.

It consists of fixed disks with circumferential sliding and toothedrings, and of a movable units-and-tens disk, operated by a thumbwheeland interior shaft, and by a sliding and eccentrically-pivotedcatch-lever.

A fixed arm with pointer or index end extends from thesupporting-standards, and carries a small end pinion, that is turned byeach revolution of the adjoining sliding ring by a fixed lug at thezero-point for one tooth, and moves the next ring forward thereby.

In the drawing, A represents thebase of my improved addingmachine, whichis made of cast bronze, in-ornam ental manner, and heavy enough to beused on the desk as a paperweight.

Two upright standards, B, that carry the operating-shaft of the machine,are cast in one piece with the base. The standards carry, in suitablebearings, the interior shaft 0, having a thumb-wheel at the outer end,and an outer shaft or sleeve, 0, that takes up the weight of therevolving wheel D, the interior shaft turning loosely in the outershaft.

Two or more disks, E, or a drum of suitable width, are arranged sidewiseof the revolving wheel D on the shaft, and secured into rigid positionby a thumb-screw, a, that passes through one of the standards B into thedisks or drum E.

The revolving wheel D is provided at the periphery with a fixed band orstrip, on which PATENT OFFICE.

the numbers from 0 to 99 are printed, the disks or drum being providedwith guid4 flanges b, and with sliding and toothed enciicling springbands or rings E, of which two or more are arranged, according to the nubers of figures of the sums for which the m chine is to be used.

The bands or rings E are also providl with printed strips having thenumbers fro l l to 100 thereon, and are fitted tightly, b t looselyenough to turn freely on the dru when operated by a catch-lever, F, thats eccentrically pivoted to the inner shafts I passed through a recess,d, of outer shaft, ar along a guide-groove, d, and staple d to tcircumference of the revolving wheel D, e tending by its hook-shaped endover the whe and into the serrations or perforations of t t adjoiningband or ring E of the drum, shown clearly in Figs. 1 and 2.

The eccentric pivoting of the catch-lever in connection with theguide-slot of the outr shaft 0, produces the raising of the catch-lverby a turn of the shaft in one directio and a lowering of the same byturning in o posite directions, before it begins to opera e the outershaft and wheel. When lowerd the catch-lever turns both the outer shaftar (1 wheel D, and carries also, by the entering the hook end, thesliding ring E of the a joining disk forward, releasing the same thereturn motion of the wheel and simulta ous raising of the catch-leverhook.

An arm, G, is attached firmly to one of t e standards B, extends alongthe revolving di and is bent at the circumference of the sa u has asmall pinion or spur-wheel, f, attach d loosely at its outer end, andgearing with te teeth or perforations of the second slidi g ring E ofthe drum.

The first ring E is provided at the zero-po' with a fixed lug or point,g, that extends or r the second ring, and engages one of the te of thepinion whenever one of its revoluti s is completed, so as to move thepinion, ad thereby the second ring, forward for one too h, indicatingthereby the hundreds and thu sands to sum up to ten thousand.

If a third ring is used a second pinion is rranged, that meshes inanalogous man er therewith, and is operated by a fixed lug at thezero-point of the second ring.

The machineis operated in the following manner: The sliding rings areturned until the zero-points connect with each other, and with thepinion and fixed stop of arm G, so that the pinion will stand in 1, andthe stop of the first sliding ring in line with the pointer. Therevolving wheel and catch-lever are then turned by the th umb-wheeluntil the catch-lever forms contact with the stop-piece of arm G, whenthe wheel is turned in opposite direction and the catch-lever drawn inso as to take along the first ring-band until the first figure to beadded appears on the revolving wheel in line with the pointer.

The catch-lever and wheel are then turned 'back to the stop-piece, andturned forward again until the second number appears thereon, and so on,the catch-1ever moving the first band, and the first band movingautomatically the pinion, and thereby the second sliding band and so on,the sum total of all the num bers being finally read off at the pointerf, being in line therewith.

The addition of different numbers is thus accomplished mechanically inneat, quick, and accurate manner, without the least chance of makingmistakes.

only necessary to set the band indicating the 100 and 1,000 with thefinger, as the unitsand-tens band may be set easily and readily by thewheel and catch-lever.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In setting the bands it is 1. An adding-machine composed of a revolvingdisk, with eccentrically-sliding catchlever, of fixed adjoining disks,or a drum having sliding and numbered bands or ring, and of a stationaryarm with front pointer or stop-' piece, and intermeshing pinion, allarranged substantially in the manner and for the purpose specified.

2. The combination of the shaft 0, eccen-' trically-pivoted catch-leverF, revolving wheel D, stationary arm G, and stop-piece f, and slidingadjoining band E, substantially as and for the purpose specified.

3. The combination of the inner shaft 0, outer sleeve or shaft 0, havingrecess 11, cccentrically pivoted and guided catch-lever F, and revolvingwheel D, to first raise or lower the catch-lever, and then turn thewheel, substantially as specified.

4. The combination of the revolving disk D and catch-lever F with thesliding and toothed adjoining band E, to engage the same and carry itforward, substantially as described.

5.- The combination of the revolving disk D and catch-lever F with thefirst sliding and toothed band E, having zero stop or point g, withpinion f of stop-piece G, and with the second sliding and toothed bandE, substantially in the manner and for the purpose specified.

MARSHALL M. SMITH.

' Witnesses:

JOHN R. HOLMES, W. EDGAR ILES.

